Peter, I've got OMI and Atlas C424s. The cab area on the OM is brass, so is more, er ... delicate looking. I've taken the cab-end drive out of a couple of my Atlas diesels for cab detailing, but the haulage difference is minimal (10 -15 car trains) and means I can MU them on 'smaller' controllers. Mind you my SW hasn't asked for more than 2-amps, except when I've held it down!
Jason